Tread portion of an automobile tire



FIG. 1 is a perspective view of a tread portion of an automobile tire according to my design;

FIG. 2 is a front view thereof;

FIG. 3 is a plane view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is rear view thereof; and

FIG. 6 is a fragmentary enlarged view showing the details of the tread portion thereof; and,

FIG. 7 is an end view taken along line 7-7 in FIG. 6 thereof.

Broken lines in the drawing figures are used to show portions of the tire that are not being claimed, and thus form no part of the claimed design. 

CLAIM The ornamental design for a tread portion of an automobile tire, as shown and described. 